Update db only if ContentValues obj being inserted is not empty.

Bug: 20701423
Change-Id: I42e8fc05b39976b0ec07c0eefcca91b60f6d3694
diff --git a/src/com/android/providers/telephony/TelephonyProvider.java b/src/com/android/providers/telephony/TelephonyProvider.java
index 12430de..8cb01dc 100644
--- a/src/com/android/providers/telephony/TelephonyProvider.java
+++ b/src/com/android/providers/telephony/TelephonyProvider.java
@@ -928,12 +928,9 @@
                 mergedValues.putAll(newRow);
             }
 
-            try {
+            if (mergedValues.size() > 0) {
                 db.update(table, mergedValues, "_id=" + oldRow.getInt(oldRow.getColumnIndex("_id")),
                         null);
-            } catch (Exception e) {
-                loge("mergeFieldsAndUpdateDb: Unexpected exception on db.update " + e);
-                loge("mergeFieldsAndUpdateDb: Failed to add updated values to db:" + mergedValues);
             }
         }